Event: Division 3

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Opponent Rating Result
John Lightowler 1676 0 - 1
Jeffrey Blumsom 1654 1 - 0
David O Vaughan 1820 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1717 = (5150 + 400 * (1 - 1)) / 3)

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